Date: Mon, 20 Nov 2023 15:30:33 -0800
Hi all,
We have a 400 MHz Avance III HD with a MAS3 unit and a K3166 solids probe
(full name: MASVTN400S1 BL4 N-P/H) that's been having some real problems while
trying to spin. A few months ago, when trying to spin, it would stop
abruptly (or not even start spinning) and give the error: "A critical error
occurred (Bearing Pressures). Please get the logs and contact customer
service". (Also our MAS unit would sometimes be so bricked afterwards
that I had to remove its battery for a few seconds to get it to start
communicating again.) I sent the probe into Bruker for repair.
They removed and cleaned the stator assembly, which was found to be dirty and
tested the tune and spinning. When I got the probe back, it worked
flawlessly for one weekend of data collection, then started giving the Bearing
Pressure error again. Eventually, a Bruker service rep had me Tee the
line from Bearing gas so that it fed back into the "Sense of Bearing" port on
the MAS3... which seems to have fixed that error.
But we are still having a problem with spin (or spin detection). When
I try spinning to 5000 Hz, it ramps up to about 1300 and then stops, eventually
giving the error in the picture below:
I get this error even when I try spinning a newly-purchased, empty rotor with a
laser score mark. I've tried both without black Sharpie marker and with
marker (opposite from the laser score mark) - neither works.
It seems like maybe spin detection is not working. Does anybody have
any suggestions for how to "check the fiber optic at the probe" without ruining
the alignment of the optic cables? Or how to clean the fiber optic
detection "window"? Or anything else???
Thanks!
Wendy
Wendy Breyer, Ph.D.
Director of Instrumentation
Dept of Chemistry
Lehigh University
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